Safety Master Casters®Contemporary design, strength and performance make these replacement casters an excellent choice for office and home furnishings. With appropriate stems and fasteners, each caster can be used on wood, metal and tubular metal chairs, furniture and other equipment. All casters carry the manufacturer's guarantee against defects in material and workmanship.Rolls when you're seated, brake keeps chair from rolling when you stand. Ideal for hard surfaces and low pile carpeting where runaway chairs are a problem. Dual 2" diameter wheels, full hood, matte black finish. Weight rated: 100 lbs. per caster. Five casters per set.HOW TO SELECT CASTERS1. Remove caster from leg of chair base.2. Match the stem of the caster to diagram. Select the correct length and diameter. (Tops of stems can be flat or roundedeither will fit.)3. Determine if caster is to be used on chair mats, hard floors or carpeting.Choose soft wheel casters for use on chair mats, linoleum (vinyl), and hard floors; hard wheel casters for carpeting.Oversized NeckSoft Wheel Tread7/16 dia x 7/8h StemCOLOR: Matte BlackALTERNATE ITEM #: 135517, 735099, 64335, B000Q62PSS